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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 28, Iss. 4 — Apr. 1, 2011
  • pp: 696–703

Illuminant spectrum estimation at a pixel

Sivalogeswaran Ratnasingam and Javier Hernández-Andrés  »View Author Affiliations

JOSA A, Vol. 28, Issue 4, pp. 696-703 (2011)

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In this paper, an algorithm is proposed to estimate the spectral power distribution of a light source at a pixel. The first step of the algorithm is forming a two-dimensional illuminant invariant chromaticity space. In estimating the illuminant spectrum, generalized inverse estimation and Wiener estimation methods were applied. The chromaticity space was divided into small grids and a weight matrix was used to estimate the illuminant spectrum illuminating the pixels that fall within a grid. The algorithm was tested using a different number of sensor responses to determine the optimum number of sensors for accurate colorimetric and spectral reproduction. To investigate the performance of the algorithm realistically, the responses were multiplied with Gaussian noise and then quantized to 10 bits . The algorithm was tested with standard and measured data. Based on the results presented, the algorithm can be used with six sensors to obtain a colorimetrically good estimate of the illuminant spectrum at a pixel.

© 2011 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision
(330.1730) Vision, color, and visual optics : Colorimetry
(150.1135) Machine vision : Algorithms
(150.6044) Machine vision : Smart cameras

ToC Category:
Machine Vision

Original Manuscript: February 11, 2011
Manuscript Accepted: February 12, 2011
Published: March 31, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

Sivalogeswaran Ratnasingam and Javier Hernández-Andrés, "Illuminant spectrum estimation at a pixel," J. Opt. Soc. Am. A 28, 696-703 (2011)

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